Κατεύθυνση Βιολογική Ωκεανογραφία
Library of the School of Science

2023-07-11

2023

Boziki Dimitra

Ραΐτσος Διονύσιος (Επιβλέπων), Επίκουρος Καθηγητής Θαλάσσιας Βιολογίας, Τμήμα Βιολογίας, ΕΚΠΑ
Οικονόμου Αθηνά, Ομότιμη Καθηγήτρια, Τμήμα Βιολογίας, ΕΚΠΑ
Μεγαλοφώνου Περσεφόνη, Καθηγήτρια Ιχθυολογίας, Τμήμα Βιολογίας, ΕΚΠΑ

Εποχική και ετήσια μεταβλητότητα της χλωροφύλλης-α στον Ισημερινό: Παρατηρήσεις τηλεπισκόπησης

Greek

Seasonal and annual variability of chlorophyll a in the Equatorial: remote sensing observations

Large Marine Ecosystems (LMEs) are the most productive areas of the ocean exhibiting the largest world’s annual biomass of marine fisheries and enormous levels of biodiversity. The size of this biomass depends on the production of chlorophyll-a (Chl-a), and availability of solar radiation and nutrients in the water (nitrates, phosphates, etc.) as well as on the level of and sea surface temperature (SST), according to recent findings arisen from studies about global climate change. The development of the Science of Remote Sensing with the application of new technologies in the assessment of water quality and on the other hand, recent analyses regarding the correlation of Chl-α and SST demonstrating that both the trend and the variation of these two parameters, depend on the geographical longitude and latitude, and also on the large and small scale marine characteristics of each ecosystem, actuated the topic of the current study. In this direction, our goal was to efficiently extract information from satellite remote sensing data regarding Chl-α and SST levels in 17 LMEs around Equator, as physical indicators of primary productivity for the ecosystems. The data collected covered a time period from January 1998 to December 2019. We observed that phytoplankton bloom coincides with low SST levels given the abundance of nutrients in cold waters. The consequences of the tremendous increase in global temperature in recent years were reflected on the increase in SST values and the decrease in Chl-a values found in our results. In North Brazil, the highest Chl-a concentration was observed while the highest SST was recorded in Red Sea. On the other hand, Insular Pacific – Hawaiian had the minimum phytoplankton bloom derived from limited nutrients, compared with the other studied ecosystems.

Science

Chlorophyll-a, Equator, Sea Surface Temperature, Large Marine Ecosystems, Seasonality

Yes

2

Yes

41

83

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https://pergamos.lib.uoa.gr/uoa/dl/object/3335889